How do I measure request and response times at once using cURL

2025-01-26 (Last Modified: 2025-01-26)

Measuring petition and consequence occasions is important for optimizing web site show. Realizing however agelong it takes for a server to react permits builders to pinpoint bottlenecks and better person education. However however bash you effectively seizure some petition and consequence occasions concurrently utilizing cURL, a almighty bid-formation implement frequently utilized for transferring information? This article supplies a blanket usher to attaining exactly that, providing applicable examples and adept insights.

Knowing cURL’s Clip Measure Capabilities

cURL gives constructed-successful options to dissect the timing breakdown of a petition. The -w emblem, mixed with circumstantial timing variables, unlocks a wealthiness of accusation. These variables correspond antithetic phases of the petition lifecycle, from DNS solution to information transportation completion. By knowing these variables, we tin tailor our cURL instructions to extract the circumstantial timings we demand.

Using these timings permits builders to place slowdowns successful assorted phases of the petition-consequence rhythm. Is the DNS lookup taking excessively agelong? Is the server dilatory to found a transportation? Oregon is the bottleneck successful the information transportation itself? cURL gives the information wanted to reply these questions.

Capturing Petition and Consequence Occasions Concurrently

The cardinal to capturing some petition and consequence instances lies successful utilizing the -w emblem with due format specifiers. We tin seizure idiosyncratic timings similar DNS solution, transportation constitution, and information transportation. The pursuing bid demonstrates however to seizure general clip, link clip, and transportation clip:

curl -w "%{time_total},%{time_connect},%{time_appconnect},%{time_pretransfer},%{time_redirect},%{time_starttransfer},%{time_namelookup},%{time_ssl_connect},%{time_ssl_handshake}" -o /dev/null https://www.illustration.com

This bid leverages the powerfulness of the -w emblem and pipes output to /dev/null, truthful the existent fetched contented isn’t displayed. The output volition beryllium a comma-separated drawstring of timing values successful seconds.

time_total: Entire clip for the petition.
time_connect: Clip to found the TCP transportation.
time_appconnect: Clip to found the SSL/TLS handshake (if relevant).
time_pretransfer: Clip from commencement till conscionable earlier transportation begins.
time_redirect: Clip spent connected redirects.
time_starttransfer: Clip till the archetypal byte is obtained.
time_namelookup: Clip to resoluteness the hostname.
time_ssl_connect: Clip for SSL/TLS link (if relevant).
time_ssl_handshake: Clip for SSL/TLS handshake (if relevant).

Analyzing cURL Timing Information

Erstwhile you’ve captured the timing information, the adjacent measure is investigation. This information tin beryllium fed into another instruments for visualization and reporting. You tin usage ammunition scripts to parse the output, redirecting it into a CSV record for additional investigation successful spreadsheet package oregon visualization instruments.

Usually monitoring these metrics tin uncover show traits and regressions, permitting for proactive optimization. Figuring out show bottlenecks earlier they contact customers is captious for sustaining a affirmative person education.

Applicable Purposes and Examples

Fto’s see a applicable script. Ideate you’re managing an e-commerce web site. Dilatory consequence occasions tin pb to deserted carts and mislaid gross. By utilizing cURL to frequently display API consequence occasions, you tin place and code show points earlier they contact your bottommost formation.

For case, you tin incorporated the cURL bid into a monitoring book that runs periodically, logging the consequence occasions. This permits for tendency investigation and tin alert you to immoderate important deviations from the baseline. Larn much astir web site show optimization.

Infographic Placeholder: Ocular cooperation of the cURL timing breakdown.

Utilizing cURL for Show Investigating

cURL is not a afloat-fledged show investigating implement similar JMeter oregon Gatling. Nevertheless, it tin beryllium efficaciously utilized for basal show checks and monitoring, peculiarly for azygous requests. Its simplicity and easiness of usage brand it a invaluable implement successful immoderate developer’s toolkit.

By combining cURL’s output with another instruments and scripts, you tin make a strong show monitoring scheme tailor-made to your circumstantial wants. For illustration, you might tube the output to a implement that generates graphs oregon alerts you once definite thresholds are breached.

Precocious cURL Strategies for Timing Measure

For much granular power, research choices similar penning the output to a record utilizing the -o emblem, combining it with another bid-formation instruments similar awk oregon sed for precocious parsing and processing. This permits for better flexibility successful analyzing and visualizing the information.

Tally cURL with timing choices.
Parse the output.
Analyse the information.

See utilizing instruments similar cURL successful conjunction with another show monitoring and profiling strategies for a much blanket investigation. This tin aid pinpoint bottlenecks much precisely and place areas for optimization.

Outer Assets:

Often Requested Questions:

Q: Tin I usage cURL for ample-standard show investigating?

A: Piece cURL is fantabulous for azygous requests, devoted show investigating instruments similar JMeter oregon Gatling are amended suited for ample-standard investigating.

Optimizing web site show is a steady procedure. Leveraging cURL’s timing options presents a applicable and almighty manner to addition insights into petition and consequence instances. By repeatedly monitoring these metrics, builders tin proactively place and code show bottlenecks, making certain a seamless person education. Return the clip to experimentation with the methods outlined successful this article and combine them into your workflow. You’ll beryllium amazed astatine however overmuch you tin better your web site’s velocity and responsiveness with this elemental but almighty implement. Research additional by utilizing cURL successful conjunction with another show investigating and monitoring methodologies for a much blanket knowing of your web site’s show chart.

Question & Answer :
I person a internet work that receives information successful JSON format, processes the information, and past returns the consequence to the requester.

I privation to measurement the petition, consequence, and entire clip utilizing cURL.

My illustration petition seems similar:

curl -X Station -d @record server:larboard

and I presently measurement this utilizing the clip bid successful Linux:

clip curl -X Station -d @record server:larboard

The clip bid lone measures entire clip, although - which isn’t rather what I americium wanting for.

Is location immoderate manner to measurement petition and consequence instances utilizing cURL?

From this superb weblog station… https://weblog.josephscott.org/2011/10/14/timing-particulars-with-curl/

cURL helps formatted output for the particulars of the petition (seat the cURL manpage for particulars, nether -w, –compose-retired <format>). For our functions we’ll direction conscionable connected the timing particulars that are supplied. Instances beneath are successful seconds.

Make a fresh record, curl-format.txt, and paste successful:

time_namelookup: %{time_namelookup}s\n time_connect: %{time_connect}s\n time_appconnect: %{time_appconnect}s\n time_pretransfer: %{time_pretransfer}s\n time_redirect: %{time_redirect}s\n time_starttransfer: %{time_starttransfer}s\n ----------\n time_total: %{time_total}s\n

Brand a petition:

curl -w "@curl-format.txt" -o /dev/null -s "http://wordpress.com/"

Oregon connected Home windows, it’s…

curl -w "@curl-format.txt" -o NUL -s "http://wordpress.com/"

What this does:

-w "@curl-format.txt" tells cURL to usage our format record
-o /dev/null redirects the output of the petition to /dev/null
-s tells cURL not to entertainment a advancement metre
"http://wordpress.com/" is the URL we are requesting. Usage quotes peculiarly if your URL has “&” question drawstring parameters

And present is what you acquire backmost:

time_namelookup: zero.001s time_connect: zero.037s time_appconnect: zero.000s time_pretransfer: zero.037s time_redirect: zero.000s time_starttransfer: zero.092s ---------- time_total: zero.164s

I person not but seen an action to output the outcomes successful microseconds, however if you’re alert of 1, station successful the feedback beneath.

Brand a Linux/Mac shortcut (alias)

alias curltime="curl -w \"@$Location/.curl-format.txt\" -o /dev/null -s "

Past you tin merely call…

curltime wordpress.org

Acknowledgment to commenter Pete Doyle!

Brand a Linux/Mac base-unsocial book

This book does not necessitate a abstracted .txt record to incorporate the formatting.

Make a fresh record, curltime, location successful your executable way, and paste successful:

#!/bin/bash curl -w @- -o /dev/null -s "$@" <<'EOF' time_namelookup: %{time_namelookup}\n time_connect: %{time_connect}\n time_appconnect: %{time_appconnect}\n time_pretransfer: %{time_pretransfer}\n time_redirect: %{time_redirect}\n time_starttransfer: %{time_starttransfer}\n ----------\n time_total: %{time_total}\n EOF

Past call it the aforesaid manner arsenic the alias:

curltime wordpress.org

Brand a Home windows shortcut (aka BAT record)

Make a fresh matter record known as curltime.bat successful the aforesaid folder arsenic curl.exe and curl-format.txt, and paste successful the pursuing formation:

curl -w "@%~dp0curl-format.txt" -o NUL -s %*

Past from the bid formation you tin merely call:

curltime wordpress.org

(Brand certain the folder is listed successful your Home windows Way adaptable to beryllium capable to usage the bid from immoderate folder.)